JP5592711B2 - Deburring device for powder molded products - Google Patents

Description

The present invention compresses and pulverizes fine powders of metals, ceramics, etc., and in the powder compression molding stage, which is the first half of the process when manufacturing cemented carbide chips, precision machine parts, etc., generated in the product) on to that equipment remove the "burr (protruding portion)".

  A granulated powder produced by mixing a fine powder of metal, ceramics or the like with a binder such as wax is filled in a mold of a press machine and compression molded. The compression-molded intermediate product is baked in a baking furnace to obtain a cemented carbide chip for machining or a precision machine part.

  At the time of compression molding, the pressure acting on the fine powder causes the fine powder to protrude into a slight gap in the mold, and an extended portion called “burr” is generated. Since this is an unnecessary and harmful part for the product, it must be removed before the baking treatment.

  Patent Document 1 describes that after compression molding, the intermediate product is deburred (according to the same document, the burr is also referred to as “flushing”) by a “deburring device” provided in the press. . This “deburring device” has a hollow cylindrical shape connected to the upper head of the press machine, and the inside is connected to a vacuum source and an air supply source, and pulsates around the intermediate product after molding. A stream of air is blown to separate the flashes and to be removed by vacuuming.

Special table 2001-502238 gazette

  The deburring device described in Patent Document 1 has a fairly complicated configuration such as incorporating a turbine blade rotor to generate pulsation in the air flow, which not only increases the cost but also makes it difficult to reduce the size of the device. It cannot be applied unless the dimensions of the mold or intermediate product are large to some extent.

The present invention can reduce the number of deburring steps by removing the flash of a molded product that has been compression-molded on a molding machine, and can be used to reduce the size of a mold or a compression press. an object of the present invention is to realize preparative RiSo location.

In the first aspect of the present invention, the upper punch and the lower punch are arranged above and below the die, the powder formed in the space formed by the upper and lower punches and the die, and the upper punch is lowered or the lower punch is raised. In a deburring device for a powder molded product that compresses the powder and removes the flash of the molded product, a large number of resin strands surround the upper punch and the lower punch on the upper or lower surface of the die. A plurality of brushes having a plurality of brushes disposed thereon, and vibration means for applying mechanical vibrations mainly having the direction of each wire to each brush, and the tip of the brush vibrated by the vibration means is disposed on the upper punch. or in and along the outer surface of the lower punch, thereby removing the burrs are pressed against the burr occurring on the molded article, the vibration means, including a vibration motor which is accommodated in a brush holder for holding brushes The brush holder is held via a leaf spring, in which the brush is characterized in that it is possible to shake the head in a direction perpendicular to the wire.

According to a second aspect of the present invention, in the first aspect of the present invention, air jetting means for applying an air flow toward the upper and lower punches is further provided, and the removed flash is blown off by the air flow. A deburring device for a powder molded product.

  According to the present invention, since the flash of the molded product is removed while the molded product is held by the upper and lower punches, it is possible to remove the flash before the hardness increases, and as a result, so-called deburring is achieved. It becomes easy. In addition, the number of steps for removing the flash can be reduced. And since it is only necessary to vibrate the brush in the direction of the strand, it can be easily applied to a small-size mold or a small molding machine, and the quality of the powder molded product can be maintained. Has an excellent effect.

It is a front view of the press used for implementation of this invention. It is explanatory drawing which shows the metal mold | die part of the press machine of FIG. It is the enlarged view. It is a front view of the deburring apparatus which concerns on this invention. FIG. It is a top view of the brush unit in the deburring device. It is a perspective view which shows the attachment frame and blowing frame in the deburring apparatus. It is a perspective view which partially cuts and shows the blowing frame in the deburring apparatus.

  The flash is a portion that has not been pressurized and protrudes from the mold during compression molding. Since the fine powder is mixed with the binder, it hardens with time after compression molding due to the hydrolysis reaction, but it is still soft immediately after molding, and it can be easily removed by simply rubbing lightly. In addition, in the present invention, since the flash is removed while the part to be the product is sandwiched between the upper and lower punches, there is no possibility that a part of the product is lost, and only the unnecessary part can be removed. Further, the side surface of the upper and lower punches can be constantly cleaned by further moving the removing device in the vertical direction.

Deburring in the present invention, for example, houses a small vibration motor in a brush holder that holds a brush, vibrates a brush of a predetermined diameter in the direction of the strand, and makes the tip of the strand lightly touch the portion of the flash to. Therefore, the tip of the strand is abutted against the beam. In this way, the soft flash is peeled off, and the brush holder is attached via a leaf spring, so that the brush is removed by wiping the neck in the direction perpendicular to the strands during vibration. Further, an air flow is jetted along the brush toward the upper and lower punches to wave the strands of the brush, thereby promoting the peeling action and simultaneously removing the peeled flash.

  The brush strand is a resin thread such as nylon. The diameter of the strand is preferably in the range of 0.05 to 0.3 mm. If it is thicker than this, the rigidity will be high and it will not wave due to the airflow. Moreover, even if it contacts more than this, the force to peel is insufficient.

  Hereinafter, the present invention will be described based on specific examples shown in the drawings. First, an apparatus according to the present invention will be described. FIG. 1 is a front view of a press machine that can be used to carry out the present invention. An intermediate frame 11 is fixed substantially in the middle of the frame 1 in the height direction, and four guide bars 12 are provided in the vertical direction through the intermediate frame 11. The frame 1 has a height of about 1600 mm and a width of 540 mm.

  Although not shown in this figure, a die is provided at the center of the intermediate frame 11. The upper ram 2 and the lower ram 5 are moved up and down along the guide bar 12 by drive mechanisms 21 and 51 using ball screws. An upper punch 3 and a lower punch (not shown in this figure) are attached to the upper ram 2 and the lower ram 5 through a punch holder, and the space formed by the upper and lower punches and the die is filled with powder. The powder is compressed and molded by lowering the punch or raising the lower punch. After compression by the punch, further compression by impact force can be applied using the magnetostrictive actuator 52 attached to the lower ram 5. The magnetostrictive actuator 52 may be provided in the upper ram 2.

  Reference numeral 7 denotes a deburring device, which will be described in detail later, and reference numeral 72 denotes its lifting mechanism. The type of the lifting mechanism 72 is not particularly limited, but known ones such as a pneumatic cylinder by NC control and an electric screw mechanism by a servo motor can be used. In any case, for example, a function of moving up and down following the upper punch 3 and a function of moving a necessary distance in the vertical direction at the time of deburring work are required. Since this movement distance is about 10 to 15 mm in net, about 50 mm is sufficient as the vertical stroke.

  FIG. 2 is an explanatory view showing a die part of this press machine, wherein reference numeral 4 is a die, reference numeral 3 is an upper punch, reference numeral 6 is a lower punch, reference numeral P is powder, and reference numeral G is an intermediate obtained by compressing the die. It is a product.

  First, as shown in FIG. 2 (a), the indentation formed by the lower punch 6 and the die 4 is filled with the powder P, and then the upper punch 3 is lowered from above as shown in FIG. 2 (b). The powder P is compressed to produce an intermediate product G. Subsequently, when the die 4 is lowered or the upper and lower punches 3 and 6 are raised while holding the intermediate product G, the contour portion of the intermediate product G appears on the upper portion of the die 4.

  FIG. 3A is an enlarged view in a compression molding stage corresponding to FIG. For example, if the diameter of the upper and lower punches 3 and 6 is 1.8 to 8.2 mm, the gap g (one side) between the outer peripheral surface of the upper and lower punches 3 and 6 and the inner peripheral surface of the die 4 is about 5 to 10 μm. Fine powder enters the gap g due to the pressure during compression molding, and a flash F is formed.

  FIG. 3B is an enlarged view corresponding to FIG. 2C, and a flash F appears on the die 4 together with the intermediate product G. FIG. In the present invention, deburring is performed in this state.

  4 is a front view showing the deburring device 7, and FIG. 5 is a plan view thereof. An attachment frame 71 having a rectangular frame shape or a rectangular frame shape is disposed so as to surround the upper and lower punches 3 and 6, and is moved up and down by a lifting mechanism 72 via a lifting arm 721.

  A plurality of brush units 73 are arranged on the lower surface of the mounting frame 71 so that the tip of the brush surrounds the upper and lower punches. Further, a blowing frame 74 from which air is ejected is suspended from the attachment frame 71 via a hanging member 741, and an air hose 742 for compressed air is connected to the blowing frame 74.

  FIG. 6 is a plan view showing the brush unit 73. A brush 731 made of resin fibers such as nylon and bundled together is fixed to a vibration motor 732, attached to a brush holder 734 via a leaf spring 733, and further a fiber direction (elements) of the brush 731. It is fixed to the mounting frame 71 via an adjustment mechanism 735 in the (linear direction).

  The vibration motor 732 is a disk-shaped small motor used for a cellular phone or the like, and is described in, for example, Japanese Patent Application Laid-Open Nos. 2002-205012, 2005-305261, and the like. Since the brush 731 is attached via a leaf spring 733, when the vibration motor 732 is actuated, the vibration at the tip is mainly composed of the wire direction indicated by symbol a in FIG. In order to shake the head, vibration having a component in the direction perpendicular to the strand of the brush 731 indicated by the symbol b is also accompanied. Therefore, it is possible to wipe away the powder of the particles peeled off by contact in the direction a with the component in the direction b. it can. Since the ratio of the a and b components varies depending on the distance between the brush 731 and the brush holder 734, the distance d of the bent portion of the leaf spring 733 is important and is adjusted so as to cause the above-described removing action.

  FIG. 7 is a perspective view showing the attachment frame 71 and the blowing frame 74, and FIG. 8 is a perspective view showing only the blowing frame 74. The blowout frame 74 is a rectangular or rectangular frame surrounding the upper and lower punches 3 and 6, and the cross section of the frame portion has a shape opened toward the inside. The opening is suspended from a mounting frame 71 via a suspension member 741 so that the opening faces the vicinity of the tip of the brush, and an air hose 742 for compressed air is connected thereto. Therefore, the jetted airflow is directed to the vicinity of the brush tip and blows off the peeled powder. Furthermore, since this air flow is also in the direction of the strand of the brush 731, the brush strand is waved by the air flow, and therefore vibration of the brush strand is promoted, and the peeling and removal of the flash are promoted.

  If the airflow direction can be controlled using a rectifying plate or the like, it is convenient to direct the airflow in a slightly oblique direction rather than the center, because the airflow is swirled around the upper and lower punches 3 and 6 and dust is not scattered. is there.

  As a countermeasure for the surrounding environment due to powder scattering, as shown in FIG. 4, a dust-proof hood 75 may be hung from the mounting frame 71 to form a curtain, and then sucked and discharged.

  DESCRIPTION OF SYMBOLS 1 ... Frame, 2 ... Upper ram, 3 ... Upper punch, 4 ... Die, 5 ... Lower ram, 6 ... Lower punch, 7 ... Deburring device, 11 ... Intermediate frame, 12 ... Guide bar, 21, 51 ... (Ball Screw drive mechanism 52: Magnetostrictive actuator 71: Mounting frame 72: Lifting mechanism 73: Brush unit 74: Blowout frame 75: Dust hood, 721: Arm 731, Brush 732: Vibration motor 733 ... leaf spring, 734 ... brush holder, 735 ... adjustment mechanism, 741 ... suspension member, 742 ... air hose, F ... flash, G ... intermediate product, P ... powder.

Claims (2)

An upper punch and a lower punch are arranged above and below the die, the powder is filled in the space formed by the upper and lower punches and the die, and the powder is compression molded by lowering the upper punch or raising the lower punch. In a deburring device for powder molded products to remove deburring,
A plurality of brushes in which a large number of resin wires are implanted so as to surround the upper punch and the lower punch are arranged on the upper surface or the lower surface of the die, and the direction of each wire is a main component of each brush. Vibrating means for applying mechanical vibration is provided, and the tip of the brush vibrated by the vibrating means is placed along the outer surface of the upper punch or the lower punch, and abuts against the flash generated in the molded product, and the flash is applied. The vibration means includes a vibration motor housed in a brush holder that holds a brush, the brush holder is held via a leaf spring, and the brush swings its head in a direction perpendicular to the element wire. A deburring device for powder molded products characterized in that 2. The deburring of a powder molded product according to claim 1, further comprising air jetting means for applying an air flow toward the upper and lower punches, wherein the removed flash is blown off by the air flow. apparatus.

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